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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period $ 24,797 $ 49,006 $ 24,797 $ 27,019
Impact of CECL adoption - purchased loans with credit deterioration 231      
Loans charged-off   (2,751) (2,854) (8,933)
Recoveries of loans charged-off   1,980 1,650 1,610
Net loans (charged-off) recovered   (771) (1,204) (7,323)
Provision for (reversal of) loan losses   (12,962) 20,110 [1] 5,101
Balance at end of period   35,273 49,006 24,797
Construction real estate loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 3,539 6,490 3,539 3,597
Loans charged-off   0 (40) 0
Recoveries of loans charged-off   2 28 12
Net loans (charged-off) recovered   2 (12) 12
Provision for (reversal of) loan losses   (2,705) 10 (70)
Balance at end of period   3,787 6,490 3,539
1-4 family residential real estate loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 3,833 2,270 3,833 3,844
Loans charged-off   (136) (152) (126)
Recoveries of loans charged-off   75 32 68
Net loans (charged-off) recovered   (61) (120) (58)
Provision for (reversal of) loan losses   (343) 10 47
Balance at end of period   1,866 2,270 3,833
Commercial real estate loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 9,572 35,709 9,572 13,968
Loans charged-off   0 (33) (5,247)
Recoveries of loans charged-off   87 102 113
Net loans (charged-off) recovered   87 69 (5,134)
Provision for (reversal of) loan losses   (8,816) 18,005 738
Balance at end of period   26,980 35,709 9,572
Commercial loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 6,351 4,107 6,351 3,974
Loans charged-off   (1,004) (823) (1,162)
Recoveries of loans charged-off   674 310 250
Net loans (charged-off) recovered   (330) (513) (912)
Provision for (reversal of) loan losses   (1,380) 1,823 3,289
Balance at end of period   2,397 4,107 6,351
Municipal loans        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period 570 46 570 525
Loans charged-off   0 0 0
Recoveries of loans charged-off   0 0 0
Net loans (charged-off) recovered   0 0 0
Provision for (reversal of) loan losses   1 (2) 45
Balance at end of period   47 46 570
Loans to individuals        
Allowance for Loan Losses [Roll Forward]        
Balance at beginning of period $ 932 384 932 1,111
Loans charged-off   (1,611) (1,806) (2,398)
Recoveries of loans charged-off   1,142 1,178 1,167
Net loans (charged-off) recovered   (469) (628) (1,231)
Provision for (reversal of) loan losses   281 264 1,052
Balance at end of period   $ 196 384 $ 932
Impact of CECL adoption        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment     5,072  
Impact of CECL adoption - purchased loans with credit deterioration     231  
Impact of CECL adoption | Construction real estate loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment     2,968  
Impact of CECL adoption - purchased loans with credit deterioration     (15)  
Impact of CECL adoption | 1-4 family residential real estate loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment     (1,447)  
Impact of CECL adoption - purchased loans with credit deterioration     (6)  
Impact of CECL adoption | Commercial real estate loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment     7,730  
Impact of CECL adoption - purchased loans with credit deterioration     333  
Impact of CECL adoption | Commercial loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment     (3,532)  
Impact of CECL adoption - purchased loans with credit deterioration     (22)  
Impact of CECL adoption | Municipal loans        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment     (522)  
Impact of CECL adoption - purchased loans with credit deterioration     0  
Impact of CECL adoption | Loans to individuals        
Allowance for Loan Losses [Roll Forward]        
Impact of CECL adoption - cumulative effect adjustment     (125)  
Impact of CECL adoption - purchased loans with credit deterioration     $ (59)  
[1] The increase in the provision for credit losses during 2020 was primarily due to the economic impact of COVID-19 on macroeconomic factors used in the CECL methodology.